春季是鱼种放养的最佳时期，养鱼户（尤其是新养鱼户）如何才能买到优质鱼种？笔者多年的有效经验是：到鱼塘边购买鱼种时要注意“四防”。１防塘中有死鱼养鱼户买鱼种时，要注意仔细观察鱼塘四周，如果发现鱼塘里有死鱼或相邻水面有死鱼时，不要购买。２防鱼体表发黑如果发现 Spring is the best time for stocking, fish farmers (especially new fish farmers) how to buy quality fish? The author’s many years of effective experience is: to buy fish species to pay attention to the “four defenses.” 1 dead fish in the ponds fish farmers to buy species, we must carefully observe the fish ponds around, if you find dead fish in the pond or dead fish on the adjacent surface, do not buy. 2 Anti-fish black surface if found